PLATE III. 



PAGE. 



Fig. 1. ANTHASPIDELLA SOUTULA U. & E i61 



1. View of half the upper surface of the best specimen seen. Natural size. 



1 a. About one-fourth of the lower surface of same. 



Trenton limestone, Dixon, III. 

 Illinois State Museum. 

 Fig. 2. BELEMNOSPONGIA FASCICULAKIS Ulrica 2 



2. A nearly flat subcircular specimen. Natural size. 



2 a. Edge of same enlaiged showing moulds of bundles of spieules x!2. 



2 b. One of the bundles of spieules as they appear on the upper surface. x!2. 

 Burlington, Iowa. 

 Mr. Charles Wachsmuth's collection. 



